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671 lines
17 KiB
671 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* recordmcount.c: construct a table of the locations of calls to 'mcount' |
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* so that ftrace can find them quickly. |
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* Copyright 2009 John F. Reiser <[email protected]>. All rights reserved. |
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* |
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* Restructured to fit Linux format, as well as other updates: |
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* Copyright 2010 Steven Rostedt <[email protected]>, Red Hat Inc. |
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*/ |
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|
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/* |
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* Strategy: alter the .o file in-place. |
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* |
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* Append a new STRTAB that has the new section names, followed by a new array |
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* ElfXX_Shdr[] that has the new section headers, followed by the section |
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* contents for __mcount_loc and its relocations. The old shstrtab strings, |
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* and the old ElfXX_Shdr[] array, remain as "garbage" (commonly, a couple |
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* kilobytes.) Subsequent processing by /bin/ld (or the kernel module loader) |
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* will ignore the garbage regions, because they are not designated by the |
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* new .e_shoff nor the new ElfXX_Shdr[]. [In order to remove the garbage, |
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* then use "ld -r" to create a new file that omits the garbage.] |
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*/ |
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|
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#include <sys/types.h> |
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#include <sys/mman.h> |
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#include <sys/stat.h> |
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#include <getopt.h> |
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#include <elf.h> |
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#include <fcntl.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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|
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#ifndef EM_AARCH64 |
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#define EM_AARCH64 183 |
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#define R_AARCH64_NONE 0 |
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#define R_AARCH64_ABS64 257 |
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#endif |
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#define R_ARM_PC24 1 |
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#define R_ARM_THM_CALL 10 |
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#define R_ARM_CALL 28 |
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#define R_AARCH64_CALL26 283 |
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|
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static int fd_map; /* File descriptor for file being modified. */ |
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static int mmap_failed; /* Boolean flag. */ |
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static char gpfx; /* prefix for global symbol name (sometimes '_') */ |
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static struct stat sb; /* Remember .st_size, etc. */ |
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static const char *altmcount; /* alternate mcount symbol name */ |
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static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */ |
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static void *file_map; /* pointer of the mapped file */ |
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static void *file_end; /* pointer to the end of the mapped file */ |
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static int file_updated; /* flag to state file was changed */ |
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static void *file_ptr; /* current file pointer location */ |
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|
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static void *file_append; /* added to the end of the file */ |
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static size_t file_append_size; /* how much is added to end of file */ |
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|
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/* Per-file resource cleanup when multiple files. */ |
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static void file_append_cleanup(void) |
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{ |
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free(file_append); |
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file_append = NULL; |
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file_append_size = 0; |
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file_updated = 0; |
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} |
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|
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static void mmap_cleanup(void) |
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{ |
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if (!mmap_failed) |
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munmap(file_map, sb.st_size); |
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else |
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free(file_map); |
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file_map = NULL; |
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} |
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|
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/* ulseek, uwrite, ...: Check return value for errors. */ |
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|
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static off_t ulseek(off_t const offset, int const whence) |
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{ |
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switch (whence) { |
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case SEEK_SET: |
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file_ptr = file_map + offset; |
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break; |
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case SEEK_CUR: |
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file_ptr += offset; |
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break; |
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case SEEK_END: |
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file_ptr = file_map + (sb.st_size - offset); |
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break; |
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} |
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if (file_ptr < file_map) { |
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fprintf(stderr, "lseek: seek before file\n"); |
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return -1; |
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} |
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return file_ptr - file_map; |
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} |
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static ssize_t uwrite(void const *const buf, size_t const count) |
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{ |
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size_t cnt = count; |
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off_t idx = 0; |
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file_updated = 1; |
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if (file_ptr + count >= file_end) { |
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off_t aoffset = (file_ptr + count) - file_end; |
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if (aoffset > file_append_size) { |
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file_append = realloc(file_append, aoffset); |
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file_append_size = aoffset; |
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} |
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if (!file_append) { |
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perror("write"); |
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file_append_cleanup(); |
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mmap_cleanup(); |
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return -1; |
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} |
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if (file_ptr < file_end) { |
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cnt = file_end - file_ptr; |
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} else { |
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cnt = 0; |
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idx = aoffset - count; |
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} |
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} |
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if (cnt) |
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memcpy(file_ptr, buf, cnt); |
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if (cnt < count) |
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memcpy(file_append + idx, buf + cnt, count - cnt); |
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file_ptr += count; |
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return count; |
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} |
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static void * umalloc(size_t size) |
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{ |
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void *const addr = malloc(size); |
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if (addr == 0) { |
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fprintf(stderr, "malloc failed: %zu bytes\n", size); |
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file_append_cleanup(); |
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mmap_cleanup(); |
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return NULL; |
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} |
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return addr; |
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} |
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/* |
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* Get the whole file as a programming convenience in order to avoid |
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* malloc+lseek+read+free of many pieces. If successful, then mmap |
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* avoids copying unused pieces; else just read the whole file. |
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* Open for both read and write; new info will be appended to the file. |
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* Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr |
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* do not propagate to the file until an explicit overwrite at the last. |
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* This preserves most aspects of consistency (all except .st_size) |
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* for simultaneous readers of the file while we are appending to it. |
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* However, multiple writers still are bad. We choose not to use |
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* locking because it is expensive and the use case of kernel build |
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* makes multiple writers unlikely. |
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*/ |
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static void *mmap_file(char const *fname) |
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{ |
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/* Avoid problems if early cleanup() */ |
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fd_map = -1; |
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mmap_failed = 1; |
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file_map = NULL; |
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file_ptr = NULL; |
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file_updated = 0; |
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sb.st_size = 0; |
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fd_map = open(fname, O_RDONLY); |
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if (fd_map < 0) { |
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perror(fname); |
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return NULL; |
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} |
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if (fstat(fd_map, &sb) < 0) { |
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perror(fname); |
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goto out; |
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} |
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if (!S_ISREG(sb.st_mode)) { |
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fprintf(stderr, "not a regular file: %s\n", fname); |
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goto out; |
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} |
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file_map = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, |
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fd_map, 0); |
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if (file_map == MAP_FAILED) { |
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mmap_failed = 1; |
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file_map = umalloc(sb.st_size); |
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if (!file_map) { |
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perror(fname); |
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goto out; |
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} |
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if (read(fd_map, file_map, sb.st_size) != sb.st_size) { |
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perror(fname); |
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free(file_map); |
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file_map = NULL; |
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goto out; |
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} |
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} else |
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mmap_failed = 0; |
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out: |
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close(fd_map); |
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fd_map = -1; |
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file_end = file_map + sb.st_size; |
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return file_map; |
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} |
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static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 }; |
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static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 }; |
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static unsigned char *ideal_nop; |
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static char rel_type_nop; |
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static int (*make_nop)(void *map, size_t const offset); |
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static int make_nop_x86(void *map, size_t const offset) |
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{ |
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uint32_t *ptr; |
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unsigned char *op; |
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/* Confirm we have 0xe8 0x0 0x0 0x0 0x0 */ |
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ptr = map + offset; |
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if (*ptr != 0) |
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return -1; |
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op = map + offset - 1; |
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if (*op != 0xe8) |
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return -1; |
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|
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/* convert to nop */ |
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if (ulseek(offset - 1, SEEK_SET) < 0) |
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return -1; |
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if (uwrite(ideal_nop, 5) < 0) |
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return -1; |
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return 0; |
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} |
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static unsigned char ideal_nop4_arm_le[4] = { 0x00, 0x00, 0xa0, 0xe1 }; /* mov r0, r0 */ |
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static unsigned char ideal_nop4_arm_be[4] = { 0xe1, 0xa0, 0x00, 0x00 }; /* mov r0, r0 */ |
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static unsigned char *ideal_nop4_arm; |
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static unsigned char bl_mcount_arm_le[4] = { 0xfe, 0xff, 0xff, 0xeb }; /* bl */ |
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static unsigned char bl_mcount_arm_be[4] = { 0xeb, 0xff, 0xff, 0xfe }; /* bl */ |
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static unsigned char *bl_mcount_arm; |
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static unsigned char push_arm_le[4] = { 0x04, 0xe0, 0x2d, 0xe5 }; /* push {lr} */ |
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static unsigned char push_arm_be[4] = { 0xe5, 0x2d, 0xe0, 0x04 }; /* push {lr} */ |
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static unsigned char *push_arm; |
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static unsigned char ideal_nop2_thumb_le[2] = { 0x00, 0xbf }; /* nop */ |
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static unsigned char ideal_nop2_thumb_be[2] = { 0xbf, 0x00 }; /* nop */ |
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static unsigned char *ideal_nop2_thumb; |
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static unsigned char push_bl_mcount_thumb_le[6] = { 0x00, 0xb5, 0xff, 0xf7, 0xfe, 0xff }; /* push {lr}, bl */ |
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static unsigned char push_bl_mcount_thumb_be[6] = { 0xb5, 0x00, 0xf7, 0xff, 0xff, 0xfe }; /* push {lr}, bl */ |
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static unsigned char *push_bl_mcount_thumb; |
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static int make_nop_arm(void *map, size_t const offset) |
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{ |
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char *ptr; |
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int cnt = 1; |
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int nop_size; |
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size_t off = offset; |
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ptr = map + offset; |
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if (memcmp(ptr, bl_mcount_arm, 4) == 0) { |
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if (memcmp(ptr - 4, push_arm, 4) == 0) { |
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off -= 4; |
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cnt = 2; |
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} |
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ideal_nop = ideal_nop4_arm; |
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nop_size = 4; |
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} else if (memcmp(ptr - 2, push_bl_mcount_thumb, 6) == 0) { |
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cnt = 3; |
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nop_size = 2; |
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off -= 2; |
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ideal_nop = ideal_nop2_thumb; |
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} else |
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return -1; |
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|
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/* Convert to nop */ |
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if (ulseek(off, SEEK_SET) < 0) |
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return -1; |
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do { |
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if (uwrite(ideal_nop, nop_size) < 0) |
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return -1; |
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} while (--cnt > 0); |
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return 0; |
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} |
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static unsigned char ideal_nop4_arm64[4] = {0x1f, 0x20, 0x03, 0xd5}; |
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static int make_nop_arm64(void *map, size_t const offset) |
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{ |
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uint32_t *ptr; |
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ptr = map + offset; |
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/* bl <_mcount> is 0x94000000 before relocation */ |
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if (*ptr != 0x94000000) |
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return -1; |
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/* Convert to nop */ |
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if (ulseek(offset, SEEK_SET) < 0) |
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return -1; |
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if (uwrite(ideal_nop, 4) < 0) |
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return -1; |
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return 0; |
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} |
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static int write_file(const char *fname) |
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{ |
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char tmp_file[strlen(fname) + 4]; |
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size_t n; |
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if (!file_updated) |
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return 0; |
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sprintf(tmp_file, "%s.rc", fname); |
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/* |
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* After reading the entire file into memory, delete it |
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* and write it back, to prevent weird side effects of modifying |
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* an object file in place. |
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*/ |
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fd_map = open(tmp_file, O_WRONLY | O_TRUNC | O_CREAT, sb.st_mode); |
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if (fd_map < 0) { |
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perror(fname); |
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return -1; |
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} |
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n = write(fd_map, file_map, sb.st_size); |
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if (n != sb.st_size) { |
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perror("write"); |
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close(fd_map); |
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return -1; |
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} |
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if (file_append_size) { |
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n = write(fd_map, file_append, file_append_size); |
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if (n != file_append_size) { |
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perror("write"); |
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close(fd_map); |
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return -1; |
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} |
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} |
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close(fd_map); |
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if (rename(tmp_file, fname) < 0) { |
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perror(fname); |
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return -1; |
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} |
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return 0; |
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} |
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/* w8rev, w8nat, ...: Handle endianness. */ |
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static uint64_t w8rev(uint64_t const x) |
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{ |
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return ((0xff & (x >> (0 * 8))) << (7 * 8)) |
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| ((0xff & (x >> (1 * 8))) << (6 * 8)) |
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| ((0xff & (x >> (2 * 8))) << (5 * 8)) |
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| ((0xff & (x >> (3 * 8))) << (4 * 8)) |
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| ((0xff & (x >> (4 * 8))) << (3 * 8)) |
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| ((0xff & (x >> (5 * 8))) << (2 * 8)) |
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| ((0xff & (x >> (6 * 8))) << (1 * 8)) |
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| ((0xff & (x >> (7 * 8))) << (0 * 8)); |
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} |
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static uint32_t w4rev(uint32_t const x) |
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{ |
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return ((0xff & (x >> (0 * 8))) << (3 * 8)) |
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| ((0xff & (x >> (1 * 8))) << (2 * 8)) |
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| ((0xff & (x >> (2 * 8))) << (1 * 8)) |
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| ((0xff & (x >> (3 * 8))) << (0 * 8)); |
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} |
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static uint32_t w2rev(uint16_t const x) |
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{ |
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return ((0xff & (x >> (0 * 8))) << (1 * 8)) |
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| ((0xff & (x >> (1 * 8))) << (0 * 8)); |
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} |
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static uint64_t w8nat(uint64_t const x) |
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{ |
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return x; |
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} |
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static uint32_t w4nat(uint32_t const x) |
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{ |
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return x; |
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} |
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static uint32_t w2nat(uint16_t const x) |
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{ |
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return x; |
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} |
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static uint64_t (*w8)(uint64_t); |
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static uint32_t (*w)(uint32_t); |
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static uint32_t (*w2)(uint16_t); |
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|
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/* Names of the sections that could contain calls to mcount. */ |
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static int is_mcounted_section_name(char const *const txtname) |
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{ |
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return strncmp(".text", txtname, 5) == 0 || |
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strcmp(".init.text", txtname) == 0 || |
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strcmp(".ref.text", txtname) == 0 || |
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strcmp(".sched.text", txtname) == 0 || |
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strcmp(".spinlock.text", txtname) == 0 || |
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strcmp(".irqentry.text", txtname) == 0 || |
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strcmp(".softirqentry.text", txtname) == 0 || |
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strcmp(".kprobes.text", txtname) == 0 || |
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strcmp(".cpuidle.text", txtname) == 0; |
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} |
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static char const *already_has_rel_mcount = "success"; /* our work here is done! */ |
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/* 32 bit and 64 bit are very similar */ |
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#include "recordmcount.h" |
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#define RECORD_MCOUNT_64 |
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#include "recordmcount.h" |
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static int arm_is_fake_mcount(Elf32_Rel const *rp) |
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{ |
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switch (ELF32_R_TYPE(w(rp->r_info))) { |
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case R_ARM_THM_CALL: |
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case R_ARM_CALL: |
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case R_ARM_PC24: |
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return 0; |
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} |
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return 1; |
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} |
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static int arm64_is_fake_mcount(Elf64_Rel const *rp) |
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{ |
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return ELF64_R_TYPE(w8(rp->r_info)) != R_AARCH64_CALL26; |
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} |
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|
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/* 64-bit EM_MIPS has weird ELF64_Rela.r_info. |
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* http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf |
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* We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40] |
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* to imply the order of the members; the spec does not say so. |
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* typedef unsigned char Elf64_Byte; |
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* fails on MIPS64 because their <elf.h> already has it! |
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*/ |
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typedef uint8_t myElf64_Byte; /* Type for a 8-bit quantity. */ |
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union mips_r_info { |
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Elf64_Xword r_info; |
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struct { |
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Elf64_Word r_sym; /* Symbol index. */ |
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myElf64_Byte r_ssym; /* Special symbol. */ |
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myElf64_Byte r_type3; /* Third relocation. */ |
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myElf64_Byte r_type2; /* Second relocation. */ |
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myElf64_Byte r_type; /* First relocation. */ |
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} r_mips; |
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}; |
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static uint64_t MIPS64_r_sym(Elf64_Rel const *rp) |
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{ |
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return w(((union mips_r_info){ .r_info = rp->r_info }).r_mips.r_sym); |
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} |
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static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type) |
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{ |
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rp->r_info = ((union mips_r_info){ |
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.r_mips = { .r_sym = w(sym), .r_type = type } |
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}).r_info; |
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} |
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static int do_file(char const *const fname) |
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{ |
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unsigned int reltype = 0; |
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Elf32_Ehdr *ehdr; |
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int rc = -1; |
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ehdr = mmap_file(fname); |
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if (!ehdr) |
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goto out; |
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w = w4nat; |
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w2 = w2nat; |
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w8 = w8nat; |
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switch (ehdr->e_ident[EI_DATA]) { |
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static unsigned int const endian = 1; |
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default: |
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fprintf(stderr, "unrecognized ELF data encoding %d: %s\n", |
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ehdr->e_ident[EI_DATA], fname); |
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goto out; |
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case ELFDATA2LSB: |
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if (*(unsigned char const *)&endian != 1) { |
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/* main() is big endian, file.o is little endian. */ |
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w = w4rev; |
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w2 = w2rev; |
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w8 = w8rev; |
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} |
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ideal_nop4_arm = ideal_nop4_arm_le; |
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bl_mcount_arm = bl_mcount_arm_le; |
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push_arm = push_arm_le; |
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ideal_nop2_thumb = ideal_nop2_thumb_le; |
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push_bl_mcount_thumb = push_bl_mcount_thumb_le; |
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break; |
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case ELFDATA2MSB: |
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if (*(unsigned char const *)&endian != 0) { |
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/* main() is little endian, file.o is big endian. */ |
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w = w4rev; |
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w2 = w2rev; |
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w8 = w8rev; |
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} |
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ideal_nop4_arm = ideal_nop4_arm_be; |
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bl_mcount_arm = bl_mcount_arm_be; |
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push_arm = push_arm_be; |
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ideal_nop2_thumb = ideal_nop2_thumb_be; |
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push_bl_mcount_thumb = push_bl_mcount_thumb_be; |
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break; |
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} /* end switch */ |
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if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0 || |
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w2(ehdr->e_type) != ET_REL || |
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ehdr->e_ident[EI_VERSION] != EV_CURRENT) { |
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fprintf(stderr, "unrecognized ET_REL file %s\n", fname); |
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goto out; |
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} |
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|
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gpfx = '_'; |
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switch (w2(ehdr->e_machine)) { |
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default: |
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fprintf(stderr, "unrecognized e_machine %u %s\n", |
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w2(ehdr->e_machine), fname); |
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goto out; |
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case EM_386: |
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reltype = R_386_32; |
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rel_type_nop = R_386_NONE; |
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make_nop = make_nop_x86; |
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ideal_nop = ideal_nop5_x86_32; |
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mcount_adjust_32 = -1; |
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gpfx = 0; |
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break; |
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case EM_ARM: |
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reltype = R_ARM_ABS32; |
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altmcount = "__gnu_mcount_nc"; |
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make_nop = make_nop_arm; |
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rel_type_nop = R_ARM_NONE; |
|
is_fake_mcount32 = arm_is_fake_mcount; |
|
gpfx = 0; |
|
break; |
|
case EM_AARCH64: |
|
reltype = R_AARCH64_ABS64; |
|
make_nop = make_nop_arm64; |
|
rel_type_nop = R_AARCH64_NONE; |
|
ideal_nop = ideal_nop4_arm64; |
|
is_fake_mcount64 = arm64_is_fake_mcount; |
|
break; |
|
case EM_IA_64: reltype = R_IA64_IMM64; break; |
|
case EM_MIPS: /* reltype: e_class */ break; |
|
case EM_PPC: reltype = R_PPC_ADDR32; break; |
|
case EM_PPC64: reltype = R_PPC64_ADDR64; break; |
|
case EM_S390: /* reltype: e_class */ break; |
|
case EM_SH: reltype = R_SH_DIR32; gpfx = 0; break; |
|
case EM_SPARCV9: reltype = R_SPARC_64; break; |
|
case EM_X86_64: |
|
make_nop = make_nop_x86; |
|
ideal_nop = ideal_nop5_x86_64; |
|
reltype = R_X86_64_64; |
|
rel_type_nop = R_X86_64_NONE; |
|
mcount_adjust_64 = -1; |
|
gpfx = 0; |
|
break; |
|
} /* end switch */ |
|
|
|
switch (ehdr->e_ident[EI_CLASS]) { |
|
default: |
|
fprintf(stderr, "unrecognized ELF class %d %s\n", |
|
ehdr->e_ident[EI_CLASS], fname); |
|
goto out; |
|
case ELFCLASS32: |
|
if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr) |
|
|| w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) { |
|
fprintf(stderr, |
|
"unrecognized ET_REL file: %s\n", fname); |
|
goto out; |
|
} |
|
if (w2(ehdr->e_machine) == EM_MIPS) { |
|
reltype = R_MIPS_32; |
|
is_fake_mcount32 = MIPS32_is_fake_mcount; |
|
} |
|
if (do32(ehdr, fname, reltype) < 0) |
|
goto out; |
|
break; |
|
case ELFCLASS64: { |
|
Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr; |
|
if (w2(ghdr->e_ehsize) != sizeof(Elf64_Ehdr) |
|
|| w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) { |
|
fprintf(stderr, |
|
"unrecognized ET_REL file: %s\n", fname); |
|
goto out; |
|
} |
|
if (w2(ghdr->e_machine) == EM_S390) { |
|
reltype = R_390_64; |
|
mcount_adjust_64 = -14; |
|
} |
|
if (w2(ghdr->e_machine) == EM_MIPS) { |
|
reltype = R_MIPS_64; |
|
Elf64_r_sym = MIPS64_r_sym; |
|
Elf64_r_info = MIPS64_r_info; |
|
is_fake_mcount64 = MIPS64_is_fake_mcount; |
|
} |
|
if (do64(ghdr, fname, reltype) < 0) |
|
goto out; |
|
break; |
|
} |
|
} /* end switch */ |
|
|
|
rc = write_file(fname); |
|
out: |
|
file_append_cleanup(); |
|
mmap_cleanup(); |
|
return rc; |
|
} |
|
|
|
int main(int argc, char *argv[]) |
|
{ |
|
const char ftrace[] = "/ftrace.o"; |
|
int ftrace_size = sizeof(ftrace) - 1; |
|
int n_error = 0; /* gcc-4.3.0 false positive complaint */ |
|
int c; |
|
int i; |
|
|
|
while ((c = getopt(argc, argv, "w")) >= 0) { |
|
switch (c) { |
|
case 'w': |
|
warn_on_notrace_sect = 1; |
|
break; |
|
default: |
|
fprintf(stderr, "usage: recordmcount [-w] file.o...\n"); |
|
return 0; |
|
} |
|
} |
|
|
|
if ((argc - optind) < 1) { |
|
fprintf(stderr, "usage: recordmcount [-w] file.o...\n"); |
|
return 0; |
|
} |
|
|
|
/* Process each file in turn, allowing deep failure. */ |
|
for (i = optind; i < argc; i++) { |
|
char *file = argv[i]; |
|
int len; |
|
|
|
/* |
|
* The file kernel/trace/ftrace.o references the mcount |
|
* function but does not call it. Since ftrace.o should |
|
* not be traced anyway, we just skip it. |
|
*/ |
|
len = strlen(file); |
|
if (len >= ftrace_size && |
|
strcmp(file + (len - ftrace_size), ftrace) == 0) |
|
continue; |
|
|
|
if (do_file(file)) { |
|
fprintf(stderr, "%s: failed\n", file); |
|
++n_error; |
|
} |
|
} |
|
return !!n_error; |
|
}
|
|
|